1. Middle Danube 1:100,000. A.M.S. M671 (G.S.G.S. 4416). Sopron. Image Princeton University Public content 1943. Army Map Service. This is a map of the city of Sopron in a series of maps of the Danube River shown at a 1:100,000 scale. The map was created for use by War and Navy... Army Map Service.